Remove wrong type in file_system_entity

sdk/lib/io/file_system_entity.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of dart.io;
 
 class FileSystemEntityType {
   static const FILE = const FileSystemEntityType._internal(0);
   static const DIRECTORY = const FileSystemEntityType._internal(1);
   static const LINK = const FileSystemEntityType._internal(2);
@@ skipping 55 matching lines @@
    */
   final int size;
 
   FileStat._internal(this.changed,
                      this.modified,
                      this.accessed,
                      this.type,
                      this.mode,
                      this.size);
 
-  external static List<int> _statSync(String path);
+  external static _statSync(String path);
 
 
   /**
    * Calls the operating system's stat() function on [path].
    * Returns a [FileStat] object containing the data returned by stat().
    * If the call fails, returns a [FileStat] object with .type set to
    * FileSystemEntityType.NOT_FOUND and the other fields invalid.
    */
   static FileStat statSync(String path) {
     // Trailing path is not supported on Windows.
@@ skipping 677 matching lines @@
     return buffer.toString();
   }
 }
 
 
 class _FileSystemWatcher {
   external static Stream<FileSystemEvent> watch(
       String path, int events, bool recursive);
   external static bool get isSupported;
 }